Income Taxes - Schedule of Reconciliation of Gross Net Operating Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
NOLs	$ 26,070	$ 109,839	$ 140,959	$ 136,515
NOLs deemed worthless	(3,487)	(3,487)
Unrecognized stock-based compensation	(17,863)	(101,108)
Gross NOLs available for deferred tax asset	$ 4,720	$ 5,244
Tax rate	38.74%	38.38%
Tax affected	$ 1,828	$ 2,013

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant